The Shine Potion makes your character glow for 5 minutes, which is useful for exploring caves underground, or even if you just want some light during the night. It loses some of its usefulness when you obtain the Shadow Orb (previously called the Orb of Light), as the materials needed to make the potion could be used for more useful potions. However, unlike the Shadow Orb, it follows the player without lagging behind, and is much brighter.